Granted Patent
Utility
US 5,909,486 · App. 08/820,500
Method and apparatus for awarding and redeeming prepaid telephone time
Inventors:
Jay S. Walker, James A. Jorasch
Patented Case
View Patent ↗
Granted: Jun 1, 1999
Filed: Mar 19, 1997
Inventors
Jay S. Walker
James A. Jorasch
Assignee (at issue)
Walker Asset Management Limited Partnership
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.